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Striping of Corrugated Board in Full-tone Flexo Post-Printing
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences, Engineering and Mathematics. (FSCN – Fibre Science and Communication Network)
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences, Engineering and Mathematics.
2008 (English)In: Appita journal, ISSN 1038-6807, Vol. 61, no 1, 35-40 p.Article in journal (Refereed) Published
Abstract [en]

Striping is a print defect that is often seen in flexo post-printing on corrugated board. It appears as lines parallel to the flutes of the corrugated medium (fluting). These lines are generally thought to be print density and/or print gloss variations. The objective of this Paper is to obtain fundamental understanding of the striping mechanism. Print density and print gloss have been determined as a function of printing pressure. Typical printing pressure variations have also been determined by a non-linear finite element method. A 2D reflectance mapping has been performed for printed corrugated boards. The results showed that striping is dominated by print density variations for uncoated board, and the print density variations are, in turn, caused by the printing pressure variations. The extent to which the pressure variations appear as print density variations depends on the ink transfer characteristics of the liner board.

Place, publisher, year, edition, pages
2008. Vol. 61, no 1, 35-40 p.
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:miun:diva-312ISI: 000252686700007Scopus ID: 2-s2.0-38349104629Local ID: 5138OAI: oai:DiVA.org:miun-312DiVA: diva2:1918
Projects
Nip Mechanics and Hydrodynamics of Flexo Post-Printing and Print Quality
Note
VR-ChemistryAvailable from: 2008-12-10 Created: 2008-12-02 Last updated: 2010-03-05Bibliographically approved
In thesis
1. Striping on flexo post-printed corrugated board
Open this publication in new window or tab >>Striping on flexo post-printed corrugated board
2007 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Striping is the most common print non-uniformity on corrugated board. It is defined as periodic print density and/or print gloss variations parallel to the flutes. Corrugated boards are mainly printed with flexography, making striping a major concern for the flexographic post-printing industry. In spite of its long history, the basic mechanisms of striping have not been fully understood, and no concrete solution has been provided. The objective of this thesis is to obtain an understanding of the fundamental mechanisms behind and a solution to striping. Both experimental and numerical approaches have been taken in thiswork. Nonlinear finite element models have been constructed in both corrugated board and halftone dot scales to determine the pressure distributions in the printing nip. Ink transfer experiments have been performed to determine the print density vs. pressure relations. Parametric studies have been done for the effects of printing system variables and deformations. The results showed that striping is predominantly print density variations caused by pressure variations in the printing nip. The pressure variations are inherent to the corrugated board structure. Washboarding was shown to play a minor part in causing print density variations, but might contribute to gloss striping. A new printing plate design has been proposed to eliminate the pressure variations and hence the print density striping.

Place, publisher, year, edition, pages
Sundsvall: Mittuniversitetet, 2007
Series
Mid Sweden University licentiate thesis, ISSN 1652-8948 ; 26
Keyword
Kemiteknik
National Category
Chemical Engineering
Identifiers
urn:nbn:se:miun:diva-111 (URN)5136 (Local ID)978-91-85317-63-9 (ISBN)5136 (Archive number)5136 (OAI)
Presentation
2007-10-25, 102, M, Holmgatan 10, Sundsvall, 10:00 (English)
Opponent
Supervisors
Available from: 2008-02-18 Created: 2008-02-18 Last updated: 2009-06-08Bibliographically approved
2. Nip Mechanics, Hydrodynamics and Print Quality in Flexo Post-Printing
Open this publication in new window or tab >>Nip Mechanics, Hydrodynamics and Print Quality in Flexo Post-Printing
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Sundsvall: Kopieringen, 2010
National Category
Chemical Engineering
Identifiers
urn:nbn:se:miun:diva-11347 (URN)
Public defence
(English)
Supervisors
Projects
Nip Mechanics and Hydrodynamics of Flexo Post-Printing and Print Quality
Available from: 2011-01-14 Created: 2010-03-05 Last updated: 2011-01-14Bibliographically approved

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